Buffing-machine for parts of boots and shoes.



' D. N. ROBERTSON. BUFFING MACHINE FOR PARTS OF BOOTS AND SHOES.

I APPLICATION FILED APR. 8, 1911. 1,073,288. Patented Sept. 16,1913.

3 SHEETSSHEET l.

0 on 0 l m 0 0 D. N. ROBERTSON. BUFFING MACHINE FOR PARTS OF BOOTS AND SHOES.

APPLICATION FILED APR. 8, 1911, I

Patented Sept. 16, 1913.

3 SHEETS-SHEET 2.

IIIIHN I HH llH D. ,N. ROBERTSON. BUFPING MACHINE FOR PARTS OF BOOTS AND SHOES.

APPLICATION FILED APR.8, 1911. 1 073 2 3 v Patented Sept. 16,1918.

3 SHEETSSHEET 3v I UNITED STATES PATENT oFrioE.

Dav n n. nosnn'rson, or LNLL ivrassaorrnsn'rrs, assreivon or. our-irate TQ rEnoY F. iziunsn Y, or SWAMPSCQTT, irasseonusnr'rs.

Burning- C IN roa rams or rooms AND snons.

ovaass. 7

To all whom 1' t may concern:

Be it known that I, DAVID N. Ronrnrsox,

a citizen of the United States, residing at held in place in the matrix by causing a partial vacuum underneath the stock that it is pressed firmly in the depression in the matrix by airpressure, while it is being presented to the buffing wheel. It results that the finished work is not marred or scratched, and the cornersare not broken oil, but the work is left intact, smooth andwell finished.

Another important advantage of my invention has to do *with the fact that in manufacturing these goods, it is frequently desirable to bevel the'edges without reducing the thickness ofthe center of the piece, By cuttingthe cavity in'the matrix of mymachine deeper than the thickness of the finished piece this may beac'coinplished the use of my machine as the air pressure presses ,the piece of stock to the bottom of thematrix and the operatin tool does not touch the work except at t e'edges.

'In the accompanying drawings I have also shown the stock as helng operated upon by a sand paper roll for the purposefof scouring or bufling, but other tools or operating mechanism may be employed. Accordingly' 1; have used the word .tool'in the accompanying specification to include any device employed to operate upon stock while held in place in a matrix;

The invention. will be fully understood from the following specificationtaken in connection with the accompanying drawings, and the novel features thereof are pointed out and clearly defined in the claims at the close of'this s ecification.

l- The 4 s e e tion hrough tli metres t Referringto the rawi gs, Figure 1 is Specification Mi =PatentedSept.16,1913. Application filed April 5, 911. Serial No. 619,666.

the point of contact with the'sand paper roll, said view being on a somewhat enlarged scale. Fig. 5 is a front elevation of the top part of the machine showing the means for changing the location of the operating tool as it wears.

Referring to the drawings the frame of the machine is indicated at A. It is of any convenient shape adapted to support the various working parts. In the frame is supported a ma n shaft B on the end of which is located a cyl ndrical matrix C capable of rotation. In practice I form the" matrix C with a hub 11 which extends over the end of the shaft 13 and is secured thereto in any suitablemanner, as, for instance, by a set screw 12. The matrix C'is preferably formed with a wall 16 on the side toward the hub (i. c. the left hand side as seen in Fig. 3) and is hollow and unobstructed interiorly so that the coiiperating suction box which will be described'later can be supported inside the matrix and the matrii: will still be free to rotate. The matrix C is covered with a removable facing 13 of soft metal, as for instance lead, in which one or more cavities 14 may be readily formed to receive the back side of the work to be operated upon. This facing of lead 13 is secured on one side by sliding under a flange- 52 (see Fig. 4) on the periphery'of the matrix and on the other by small screws '53.

This makes it possible to change the machine for diflerent sizes or different articles by removing the lead facing and replacing it by a new one. .The cavities are con- Y ve'niently formed by marking out. the outline of. the counter or tip on.. the surface 'of' the lead and then cutting oiltthe cavity with a knife or other tool/ The surface of the matrix and the lead exterior layer is perforated with holes or slots 15, l5fsee Fig. 2, by means of which the air from the underside of the work may be exhausted, so that the work will be held firmly in the depression in the matrix by atmospheric pressure,

on the outside of the work. The said holes are located preferably all over the surface of the lead facing so that the cavity may be formed any where on the periphery.

Inside of the matrix is located a suction box D of segmental form open on its peripheral surface, but inclosed on all the other sides thereof so that when the air is ex hausted from the interior of the suction box the only openings through which air can enter will be the holes'15, in the circum- .-ference of the rotating matrix. The suction box D is supported in brackets '18, 18, pref- 5 erably formed integral therewith, the whole being-supported upon the upper end of a slide 19 movable vertically in Waysformed in the frame A. Thescways are formed by means of guides 20, 21, secured to the cor- I 1 responding portion of the frame by means of cap screws 22. The slide 19 is adjusted vertically by means of an adjusting screw 23 provided with a set nut 24. The-slide after being adjusted is rigidly secured in place 15 by means of a cap screw 25 movable in a slot 26 in the slide 19, the inner end of the said.

cap screw 25 engaging the frame A. The gObJQGt: of this ad ustment is for the purpose of raising or lowering the suction box until 1 its edges lie close enough to the. inner sur-' [face of the cylindrical wall of the revolving matrix to prevent any serious leakage of air around the edges of the suction box and at the same time not to cause undue friction.

' The suction box is provided at 27 with ,a

pipe connection leading to an air pump, not shown, by means of which the air is exhausted from the-interior of the suction box, On a bracket 29 extending upwardly from the 30. frame A ispivotally supported a tool 30 which operates upon the surface of the piece of stock in the cavity or depression in the matrix. In the drawings I have shown this tool as a sand paper'roll of the kind here- 36 tofore frequently employed for buffing or scouring leather. .Said roll is caused to rotate by means of a belt 31 running-on a pulley 32 connected to said tool 30. The tool is carried on one end of an arm 33 pivoted at 34 to said bracket 29, the other end of said arm extending rearwardly and being engaged by a pair of adjusting screws 35 and 36 by means of which-the pressure of the tool on the work may be adjusted or varied as desired. At 38 is indicated a brush'roll supported on said pivot 34: which serves to clear the stock of dust etc. after'it passes out from. under the. tool 30. Said brushroll is driven by a belt 60. 5Q The operation of.my' machine issimple and effective. "The matrix is caused to rotate at suitable speed by the rotation of the shaft B. The operator places the piece of stock in the proper position in-the cavity 14 55,-.in the matrix and as the edge of the cavity ladvanc'es over the suction box the vacuum therein causes air pressure on the outer surface of the stock which forces the stock down in tothe cavity filling it and holding the 00 stock securely in place and in proper posi tion for presentation to the tool 30. As the rotating matrix advances, suchportions of Y the piece of Work as protrude above the line of operation of the scouring tool are removed blih'so' that the outer surface of piece of stock is left fiat. The position of the stock in the matrix'with relation to the scouring roll is plainly seen in Fig. l. In cases where it is desired. to bevel the edges of the pieces of stock the matrix cavity is made deeper than the th ckness of'the piece 'ofstock so that the tool onlyflcontacts with and that it is held there securely duringthe operation so that work having smooth faces is produced. Also no marks are made on the work and the work is never injuredor ruined by the instrumentalities which hold thestock in the cavity in the matrix while i it is being operated uponfi As the stock is'usually narrow and a sand paper roll considerablywider can be economically used, I provide means for sliding the sand paper roll relatively to the matrix, I as shown in Fig. 5 to bring a dilfe'rent portion; of the sandpaper roll in contact with the .work in the matrix. This consists in mounting the shaft 63 upon which the sand paper'roll rotate's so that it is slidable longitudinally in bearings 64 and 65' in the frame and providing at the endof the shaft 63 a collar 66 engaged by a fork 6'1 mounted on a screw 68' secured to the frame of the. machine. On both sides of said fork 67 are placed thumb nuts 69 and 70 which may be. screwed against the said fork 67 and willhold it securely in place. When it is desired to change the position of'the' sand paper roll, one of the nuts is loosened and the other screwedup to move the fork into contact with. the nut and secure it in place again."

What I claim'isz' I -1. In a machine of-the character described, the combination with a tool of a stationary j suction box having a periphery which is an arc of a circle, and a cylindrical matrix with a work receiving depression formed in its periphery, said matrix being caused to rotate and to bring the work receiving depression periodically over thesuction box.

2." In a mac hine of the chara'cter described, the cpmblnatlon with anoperating tool of a rotatlng perforated matrix having a cavity 25 in the surface thereof to receive the work,.

said matrix having an unobstructed-interior,

a stationary segmental suction box open on its periphery and cocperating with the per forated periphery of the mam-tram means for adjusting the said suction boxvertically to cause it to contact with the interior periphery of the said matrix. A 3. In a machine of'the character described,

5 the combination with anoperating tool of aperforated matrix provided with a rem0vable perforated facing of soft metalhaving a suitable cavity formed therein to receive the work, and a suction box cooperating with said matrix to cause a piece of work in 10 the said cavity to be held therein by air pressure. v

Intestimon whereof I afiix my signature, in presence 0 two witnesses.

DAVID N. ROBERTSON.

'- v Witnesses GEoRcE A. DIKE, Anon H. Monmson. 

